Submission #1297536

#	Time	Username	Problem	Language	Result	Execution time	Memory
1297536		kawhiet	Counting Mushrooms (IOI20_mushrooms)	C++20	56.08 / 100	4 ms	576 KiB

mushrooms

#include <bits/stdc++.h>
#include "mushrooms.h"
using namespace std;

constexpr int lim = 120;

int count_mushrooms(int n) {
	int res = 1;
	vector<int> a = {0}, b, s;
	for (int i = 1; i < n; i++) {
		s.push_back(i);
	}
	while (max(a.size(), b.size()) < lim && !s.empty()) {
		int x = s.back();
		if (use_machine({0, x}) == 0) {
			res++;
			a.push_back(x);
		} else {
			b.push_back(x);
		}
		s.pop_back();
	}
	vector<int> k = (a.size() == lim ? a : b);
	while (!s.empty()) {
		int m = min(lim, (int)s.size());
		vector<int> t;
		for (int i = 0; i < m; i++) {
			t.push_back(k[i]);
			t.push_back(s.back());
			s.pop_back();
		}
		int cnt = use_machine(t);
		if (a.size() == lim) {
			res += m - (cnt + 1) / 2;
		} else {
			res += (cnt + 1) / 2;
		}
	}
	return res;
}

• Subtask 1: 56.0794 / 100